Automatic shut-off mechanism for steam-engines.



No. 629,778. Patented Aug. I899. L. DA nnzm.

AUTOMATIC SHUT-DFF MECHANISM FOR sum enemas.

(Application filed Oct. 19, 1898.) (N0 Modal.)

WITNEEEJEE- UNITED STATES PATENT OFFICE.

LEVI DA ROZIR, or CAMBRI GE, MASSACHUSETTS, ASSIGNOR or FIVE- EIGHTHS TO FRANK A. TEELE AND LOUIS P. corn, on SOlllERVILLE,

MASSACHUSETTS.

AUTOMATIC SHUT-OFF MECHANlSM FoR STEAM-ENGINES.

SPECIFICATION forming part of Letters Patent No. 629,778 dated August 1, 1899.

Application filed October 19, 1898. Serial No. 694,021. (No model.)

To all whovn it ntay concern.-

Be it known that 1, LEVI DA Rozm, of Cam-' bridge, in the county of Middlesex, State of Massachusetts, have madecertain new and useful Improvements in Automatic Shut-OE Mechanisms for Steam-Engines, of which the following isa description sufficiently full, clear, and exact to enable any person skilled in the art or science to which said invention appertains to make and use the same, reference being had to the accompanying drawings, forming part of this specification, in which Figure 1 is a side elevation showing the ordinary shut-off valve in the steam-supply pipe of a stationary steam-engine provided with my improved automatic shut-oft mechanism; Fig. 2, a top plan view of the same; Fig. 3, a vertical section taken on line 3 Sin Fig. 1; and Fig. i, a cross-section, enlarged, on line 4 4 in Fig. 2.

Like letters of sponding parts in the difierent' figures of the drawings. I

My invention relates especially to a safety appliance attachable to a stationary steamengine, whereby steam may be instantly shut 0E and the engine stopped from any room of the building in which it is located in the event of accident. .Heretofore great difficulty has been experienced in communicating with the engineer in order to stop the engine in time to save the life of personswho might be caught by the shafting in remote portions of the building. Other reasons also frequently arise where it is desirable to immediately stop the engine. My invention is designed to obviate these objections, and in car v stem f of the valve is providedwith the usual hand-wheel-g,and on said stem in my improvement is mounted a steam-tight box D. The

reference indicate correinlet-pipe 0, leading to the engine, 1 tap by a branch d, in which a valve h is'incorporated. This branch d leadstangentially into the box D at 2'. (See Fig. 8.) From the under side of said box an exhaust j leads On the stem 7c of the valve it there is a weighted arm m, which normally operates to hold said valve closed and exclude steam from the box D. This arm is connected by a wire 19,

from the branch (1 will engage and impinge against said blades and rotate said Wheel, car rying the stem f and closing themain valve A. In use the hand-wheel g may be operated to i open and close the main valve in the usual manner. When it is desired to stop theengine from any cause without going to the engine-room, by pulling the cord p from any portion of the building the arm m may be elevated, opening the valve h. Steam is thus admitted to branch d from inlet C and at once expands-into box D in a jet, which, striking the blade 7 q, rotates the wheel H. This operates the valve-stem f, to which it is fast, and, closing the main valve, shuts off the steam from the boiler in a manner which will be understood by those conversant with such inatters without a more explicit description.

It will be seen that by the use of the device described the ordinary manipulation of the throttle-valve wheel is in no manner interfered with, aswould be the case were an outside mechanism belted thereto. I amaware that such mechanism'has been-used wherein steam is taken from another source; but in such devices not only is the ordinary use of the throttle greatlyhindered, but, steam being applied to an engine incorporated'in a separate steam-supply, the full pressure of such steam is maintained after the valve is shut or closed. In my device these objections are obviated. The fan-wheel being mounted directly on the throttle-stem offers no resistance to the ordinary use of said stem, and by taking steam from the engine side of said throttle or direct from the engine-supply -I obtain its full force to at once impart sufficient impetus to the fan-wheel to close the throttle. Such steam is, moreover, immediately exhausted from casing D as soon as its work is done, and as the throttle is-thns instantly closed by the action of steam direct from the inlet of the engine and said steamjs instantly shut off from the fanheel as the throttle closes there is no unnecessary escape of steam nor any bleeding of the casing D essential before starting up again or operating the throttle by hand to reopen it.

Having thus explained my invention, what I claim is 1. In a steam-engine the throttle-valve provided with a fan-Wheel on its stem in combination with a casing inclosing said wheel; an exhaust for said casing; a pipe tapping the steam-supply pipe of said engine, and opening into said casing; a valve in said first pipe and devices for operating said valve whereby steam-pressure from the engine-supply may be delivered direct to said wheel and said pressure shut off by the consequent closing of said throttle.

2. The throttle-valve and its stein in combination with the valve-inlet, B, and valveontlet, O; the fan-wheel, H, fast on said stem; the steam-box, D, inclosing said wheel and stem; the branch pipe, d, connecting said outlet, O, between the engine and throttle with said box; the valve in said branch; devices for operating said valve; and an exhaust in said box, all being arranged to operate substantially as specified.

LEVI DA ROZIR.

lVitnesses:

O. M. SHAW, O. M. WILBUR. 

